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Disabling write cache MSA1000

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Otong Sunaryo
Occasional Advisor

Disabling write cache MSA1000

Dear all,

I need to disable write cache on MSA1000 as required by application vendor.
Pls help to assist me how to disabling write cache on MSA1000.

Many thanks,
OTong
6 REPLIES
Jefferson Humber
Honored Contributor
Solution

Re: Disabling write cache MSA1000

Otong,

You could set the write cache to 0%, but have the read cache at 100%.

To do this you could use the ACU, but from the CLI it would be;

CLI> SET GLOBALS READ_CACHE=100 WRITE_CACHE=0

The read + write must equal 100.

Jeff
I like a clean bowl & Never go with the zero
John Kufrovich
Honored Contributor

Re: Disabling write cache MSA1000

Otong,
You can disable cache on a per LUN basis. Check the "Array accelerator".
Otong Sunaryo
Occasional Advisor

Re: Disabling write cache MSA1000

John,

If disabling cache per lun basis, it's only stated as "cache", i'm not sure what kind of cache is disabled, is it read or write cache ?

CLI> SET UNIT 1 CACHE=DISABLE
Cache for unit 1 has been disabled

what kind of cache has disabled ?

Pls help me to describe.

Thanks,
OTong
John Kufrovich
Honored Contributor

Re: Disabling write cache MSA1000

OTong,
Disabling cache on a per lun basis, you are disable read/write cache at the MSA controller.

May I ask, what application vendor or product is requiring you to disable write cache.

Otong Sunaryo
Occasional Advisor

Re: Disabling write cache MSA1000

Hi John,

Thanks for your information.

Application is MIMS (provided by Mincom- this application generally used by Minning company), and using oracle Database.


Best regards,
OTong
Jim Miksitz
Occasional Advisor

Re: Disabling write cache MSA1000

I too am being asked to disable write cache by Oracle. I have two Array's, first array has 1 logical unit and second has about 8 logical units. I see the option to set write to 0 and Read to 100. When I click OK to save the settings, a message appears about deleting logical units. Makes me nervous. If I make this change, it will not erase my logical drives will it ? If I'm reading it correctly, it will not, but I just want to verify with someone.

Thanks.